TABLE 2.

Results of geometry performance evaluation of drilled screw path on 3D printed spines.

Exp.	$d_a$ (mm) mean	$d_s$ (mm) mean	${\theta }_s$ (deg) mean	${\theta }_a$ (deg) mean	d (mm) median (IQR 25, 75)	$\theta$ (deg) median (IQR 25, 75)
1	0.02	−1.16	−0.85	−0.82	2.09 (1.41, 2.98)	2.03 (1.47, 3.49)
2	−0.60	−1.28	0.40	−0.81	2.12 (1.70, 3.60)	2.71 (1.44, 2.94)
3	−0.82	−1.47	−0.60	−0.87	2.33 (1.94, 3.79)	3.08 (1.88, 3.37)
Mean	−0.44	−1.30	−0.39	−0.84	2.16 (1.62, 3.49)	2.65 (1.47, 3.34)
Std	1.57	1.93	2.19	2.20